Q is the seventeenth letter in the English alphabet.(noun)
An example of q is the first letter in the word "question."
See q in Webster's New World College Dictionary
Origin: q(uality factor)Electronics the ratio of energy stored to energy lost in a component or substance
Origin: L quadransfarthing
See q in American Heritage Dictionary 4
or Qnoun pl. Q's q's or Q's also qs or Qs
Origin: Sense 5, probably from German Q(uelle), source.
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